Laser beam machining method

Abstract

A method of laser beam machining which has a simple construction and which is capable of suitably processing a part to be processed by means of laser beams is provided. A plurality of laser diode arrays 3 are stacked and disposed in such a manner as to allow radiation of laser beams in the direction of a width W of a part 1 to be processed. Each of the laser diode arrays 3 is controlled such that outputs 2 R, 2 L of laser beams with which the part 1 to be processed is irradiated in its width (W)-wise marginal portions 1 R, 1 L become higher than an output 2 C of laser beams with which the part 1 to be processed is irradiated in its width (W)-wise central portion 1 C. While the part 1 to be processed is irradiated with the laser beams with the distribution of energy thus changed, the laser beams are displaced relatively in the longitudinal direction of the part 1 to be processed.

1. A method of laser beam machining: comprising the steps of:
 disposing a plurality of laser diode arrays in a direction of a width of a part to be processed in such a manner as to allow radiation of laser beams in the direction of the width of a part to be processed, and  
 controlling each of the laser diode arrays and shaping the laser beams such that laser beams in which the part to be processed is irradiated in its widthwise marginal portions exhibit a higher intensity than laser beams with which the part to be processed is irradiated in its widthwise central portion.  
 
   
   
     2. The method of laser beam machining according to  claim 1 ,
 wherein laser beam machining is a processing which is selected from padding, welding and hardening and to which the part to be processed is subjected.  
 
   
   
     3. The method of laser beam machining according to  claim 1 , wherein shaping the laser beams includes distributing an intensity of the laser beams in a stepwise manner along a width of the part to be processed.